Convert TGF to JPG

tgf to jpg conversion is most likely related to export of graphs saved in Trivial Graph format (.tgf files) to a common JPEG graphics picture format, most likely in effort to use the graph as a picture in some document or presentation.

Unfortunately .tgf files are not supported in standard graphics editor, so you have to rely on diagramming and graphics tools instead, for example yEd. Such export should be doable simply by using save/export function found in these tools.